export const Nil: unique symbol = Symbol.for("__NIL__");
export type Nil = typeof Nil;

// @MARK trie-tree 来过滤敏感词, 也与做过的 [dfa](./src/utils/dfa.js) 似乎有点像
export type trieTree =
  | {
      [key: string]: trieTree;
    }
  | Nil;
